Device for ruling graduated scales



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Be it known that l immuni: Sonnen, a citizen othe United Shiites, anti legal resitientl oil Sole-uu county lllesliington, State of liiiiianaybave inventori; certain new and useful improvements in Devices iior Ruling Grarluateci Scales, of which the :following is a siiecilieatiou.

The invention described herein inay' be useri by tbe Government `or any oit its oliiu Cere or employees, or by any other person. in the United States in the prosecution oi work for the Government without payment el any royalty thereon.

This invention is a grauati'og or ruling rilevice designed more 'particularly for use in tlititlin engines.

The o Vice machines used although it are not lin."

y adopted for ruling; c.; optical gratings,

s to be unuerstooil that its uses to suoli Work, in devices cle.-

elgnetl to el are surfaces or Work-subjects io determine ly the I`oecror'icopic inetliocl the elen'len'ts composing' u pz'uticular 'substance under ini-f ion. aesuraslce tl'iat the linee will y ennemi relative to each ov f Such rulii'ig` or graduiuacliines .as have been heretofore lnii'iwn to ine here provided mea-ns whereby the surface entier treatinel; -for example, composite or alloyetl n'ieta'iS-fis slowly pro` peli' l by an intermittent movement in one ilirection wliile au engraving' tool o1' ruler is reci-'procutetl across tbe metal surface being;` tri-fateci. lu dei known to me, the usual protk ure in :rui A ie to oil vence tbe f 'ijigeyfsi gportu e the gra-ting definite amount, one micron. then stop the carriage and rule interval the carriage is supposed to remain stationary, but suoli ie notnlways tbe @tten there a. uilen-cy to creep or continuo this inoven'iifn" dui-inn the interval olf amour?, of friction anni l uiaeliine appear 'to tec'. 'lliis irregw azul absent at elastic proper be reslfonzsible :for i'li lar creeping? present other times, causes A. fucili clinic all ifa tcli CT ll" MARCH 3. M35

tbe line. luring this licetion :Filou August (19, 1923. Serial fo. 660,059;

sir-Afr. It, 625.3

between stops. The impact or driving force of be ratchet against the teeth has an eppreciable wearing effect and, when tbe number ot teeth in the stop integral is in excess of one total niunber oi teeth, there is introduced a definite periodic error. Such irregularities 'and periodic errors are pesent in all Work turnedL out by the usual 'type of machine. The intermittent movement of the Work-suo ject under treatment in machines ci 'this type resulte in uneven graduations or engravings and consequently produces imperfect 'gratings. Such gratings produce faulty optical results when used to determine the element or elements composing a substance.

lt is not often that a line standard ruled to inches, centimeters or other intervale has a continued accuracy better than M2500@ incli or l micron. lil'etrological laboratories often certify Values of intervals to an erectu of l/lO ot' the ebove, i. e., l/250,000 inch or l/lO micron. New ii the standard of the laboratory llas been generate-(l by a machine producing; the usual errors of l/l0,000 to l/QLOOO incl; or l/Llto l micron, it is evident that no coinparisons ere complete until the leboratory standard has been calibrated :finti the errors computed and applied. for eaol'i interval used. This calibration of intervals a meter standard divided to millimeters indy Well require the continuous labor of two nietrologists for a. period of one yea-r. ily coiistructing a machine which Will eliuiinate tl'le occurrence olf these irregular errors, it is possible to reduce tbe expenses and time necessary :tor precision length comparison.

The irregularities of line specings for diffraction gratings are likewise serious. lbe velue of a grating consists in its property' of accurately 'elili'racting the different couu'ionents oft a beern of light by an amount which is an exact :function ol tbe Wave length. The vapor spectra or light color emission of the 'various elei'nents have defi nite values or arrangements. These colors or lines, as they are Sonxetiines called', furn nisli moet positive means 'for identifying elem-ents, e. g. analyses oli tbe vapors of the .sun are made by grating spectra. Traces of ente, too si ll for chemical analysis, are

. nlcntiliecl by spectra. Wever. ifuereis always preeeiu';s "with eucli grating-e as are new wailable what liti' are commonly known, by'spectroscopists, as

ghosts. These are eXtra or superfluous color lines, Aquite like the real lines of anA element.' The position, number and intensity of ghost lines are dueto the errors of spacing of the rulings on the grating.

vWith uniform spacing of grating lines these effects will disappear and thus eliminate .under treatment may be fed at a continuous rate4 of travel in one direction, while the one embodimentgof the invention.

vengraving tool or ruling device is `accurately drawn acrossthe surface of the worksubject to thereby produce anA optical grating of uniform graduations, and which will give accurate optical results when a 4substance is lsubiected to spectroscopic tests wherein such gratings are used.

A further purpose of the invention is to provide an improved mechanism for con-- trolling the movement of the ruling device or cutter tool to lift thetool from the worksubject and to lower it into engagement with the work-subject. l A

Other objectsand advantages. will become apparent from the detailed` description. of

Generally speaking, the invention-includes means .whereby a constant or continuous .rate of travel of the carriage is effected and the occasion for irregular creepings in the intermediate-or ratchet feed type of `devices is eliminated. By omitting the oscillating ratchet or click the stop .or start impacts are avoided and a proper distance between the ruled or engraved lines may be secured by the selection of change or ratio gearsbe tween the carriage-drive and.. the rulingdrive. Moreover, the tendency toward `di a-gonal or sloping-lines of the work-subject is eliminated by setting the dividing head or ruling mechanism at the roper advance I angle so that the lines are rawn or cut at the correct angle t6 the direction ofv motion of the carriagen It is obvious thatcontinuous lateral ino/tion of the carriage may be' supplanted by a corresponding motion of the rulin mechanism- Likewise there may be a continuous motion of both.

A practical embodiment of the invention' is illustrated'in the accompanying drawing forming 'a part hereof, but it is to be understood that the structure therein' shown does not define the limits of the invention, the

C scope of which is expressed in the appended claims.

Figure 1 is a plan View of the machine. Figure 2 is a front elevation, Figure 3 is an end view.

Figure 4 `is a section on the line A-A of .Figure 1, showing the cam or eccentric which operates the cutting stylus orruling mechanism. p

Figure 5 is an enlarged detail View of the mechanism which controls the lift of the stylus.

Figure 6 is a perspective view of a portion of the device illustrating the drive mechanism.v

. In the embodiment illustrated in the ac companying drawings, the invention is adapted to an ordinary type o'fV dividing engine wherein the elements to be particularly referred to herein areniounted' on a base 12. Suitably mounted on the base'is a main drive shaft 3 which may be driven by any suitable means (not shown), such for example as a belt'drive from a motor. This drive shaft 3 is shown provided with a Worm 4 which engages a worm gear 5 carried by the transversely positioned shaft 6. A Worm 6a is meshed with a workgear 7 carried by the driving screw 1. Through the reduced gearing the rotation of the shaft 3 very slow rate of speed, but will keep the speed constant. y

Slidably mounted on the base 12 is a car-v riage 11, and a split hinged nut 2 engages the'screw 1 to move the carriage 11 longitudinally of the base. The work-subject 13, which may he a piece of metal or other substance, is suitably secured to the carriage 11 in the path of the stylus or cutter tool 14.

is transmitted to rotate the screw 1 at a io'u One of the features of the invention is the Y means to reciprocate the stylus or ruling Y device 14 across the face of ther work-subject 13. A means for accomplishing this result is shown more' particularly in Figures 1, 3, 4 and 5 of the drawings. Mouted upon the main drive shaft 3 is a cam-8 which is designed to contact with an arm 8.*:having a roller contact element 8b, which roller rides upon the face of the cam 8 and actuates the oscillating lever 9. In :order to maintain the roller contact 8b upon the face ofthe cam 8 there is provided a retracting means at 20 shown in thel form of a rod coupled to a spring which connects the rod to the base 12 ofthe machine. The rotation ofthe cam 8serves to rock the lever 9 and its shaft 10 to which itfis connected."` Positioned between the lever 9 and thet movable carriage' 11 isthe` stylus-operating mechas niam.` This mechanism is shown in the drawings as comprising a bell crank lever vrepresented by two sections 15 which lever bears against and operates another bell crank lever 17. \rod 19vis pivotally connected to one arm the lever 15 and is adjustably connected by means of the transmitting rod 19 tothe oscillating lever 9. The bell crank lever 17 is :fulcrumed upon an arcuate bail,

and one arm of the leverl? supports and nctuetes stylus holder 1S which is shown in Figure 'l ns comprising u hilfurcuted elemont pii'otzilly n'u'ninted :it fl" to the hell crunk lever 1T. The tree end ol" the bit`urcated clement 1S is provided Ywith n. small protruifling erin liti wl'iich is designed to rid" in the t op mechanism indiculed at 16 in uros l.` 53 und 5 ol the drawings. EX tending in the opposite direction `troni the free end olf this hiicurcntcd holder 18 is n.. clamping device hin-'ing n. tightening screw Il which :idjustuhly secures the cutter tool or stylus 14. lirinlv in position upon Vthe hiiurcnted stylus holder lh.

rl'he protruding urin 18 trzniscrihes e sub" stentially elliptical path on the inner tace ot the block lo holdingr the trap mechanism. ly reference to liigrure of the drawings the block 1G sl'iown priivide'd `with un escupciuent latch 2l Vwhich muy he pivoted et 22 to cause thc protruding erin 18 oi the stylus holder to pass below the latch El.' when reciprocating in one direction und to ness uhove thc hitch 2l. 'when reciprocating in the oiuiositc direction, so that thc path otihe lprotrudingY :nini '18 ivill describe un elliptical li(V ure in n clockwise direction es iiiidiceted by the nrrows in Figure 5 ot the 'urn A in operution, the shaft l is driven by any sui-telde ineens :it a predetermined rete ot sneed, and by the .reduced geared nicchunia-:ni indicated ut fl, iis t?, ii" .find T, the screw l is turned :it u very slow rete olj speed, advancing by ineens ol the nut E5, the @en .ringe ll.Y As previously stutedi the Worlr subject 'lil is secured to thc carriage ll in the. `puth ot the reciprocut. j stylus lll.. 'the r tntion ot the shnlt il will reciprocute the. hy menus ot 'hc inni H, rocking sluii't l() und its lever Sl in such :i nuinner .that the hiiu'rcstcd stylus holder .'18 Will he nioved .in nv deiined reciprocating path across the work-subject lil. It is desired that the stylus shrill cut or rule a line only on one direction of travel :rind Shall be lifted 'from the work-subject on the return movement. 1\rceordingl.v, thc preti-idling erin i8?. in 'the cniboilix'nent ot the invention illustrated, passes beneath tl'ic'cscupexnent hitch 2l on the cutting' or riiling' stroke, thereby drawing' or enginving;` the line Ytroni the forward end oit the subject l to wird the roer end ot it,- und when the' lever i) is moved in the opposite direction, thereby returning the biurcetcd stylus holder to its originel drawing' position` the protruding nrin 1S Willl ride upon the upper fuir the escapei'nent latch 2l. in the directionv indicated by the arrows in Figure 5 until. it rcuches the 'point et the escnpcinent hitch beyond the pivot 22. whereupon the stylus will he mein brought into coi'ituct with the .tace et the Work-subject to rule or engrnfve the next line. During the period oit move- Line spncings nient ot' the protrruling.;- arm from the rear ond of the escu'pement latch. to the forward end beyond the pivot 22, the continuous .movement oi.z the screw l operating' upon its.

ment of the mechanism being,` continuous es.

f listinguished from n steirby-step or inter- A'mediate iinoveinent used in the ratchet-operating .uuiclnncs, Awill cause all oi the lines so drawn or eut to be uniform in their spaced relation.

ot different velues may be secured. by replacing the gears fi, 5, 6, 62L and 2' with another set ois' gears having 'the proper ratio.

Hevingvdescribed my invention Whitt l claim is:

l. ln e ruling mztcliine comprising' e trui/cling carriage and ruling mechanism inchuling n stylus, means to cause the carriage to travel. continuously in one direction' associated with nenne to cause the stylus to be reciprocnted transversely to the movement oil the carriage.

2. in n ruling machine comprising a. traveling curriage and ruling mechanism including stylus, means to cause the oar ringe to travel continuously in one'direction ssociutcd with Ineens to cause the stylus to ho reciproceted transversely to the movement ot' the carriage, and ncontrolling means to permit the stylus to assume e Work position on one of its transverse reciprocating .n'iovemcnts end to litt the stylus from its `work position on its reverse reciprocating iiwveiiiei'it.

3. In. u machine of the class described comprising zeri.inge-propelling mechanism for u work-subject, a. stylus, and styluscar ryingi' nicchunisnn means to continuously move the carriage in one direction and nt the suine time to continuously ectunte the stylus inechsinisin to ciiuse seid stylus to travcrse7 u. dei'eru'iined path transversely of the .movement ol.' the carriage, end a controlling Incuns tor the stylus to permit the contact oi.' the stylus `with the work-subject during n part ot' the reciprocating movement.

il. i'nncliine of the clues described comprising n. cori-inge `tor e Woiksiibject, ineens to move the carriage continuously in one direction, e ruliruf` implement. means to continuously reciljnrocate the implement :icross the euri-inge, und n. controlling means including un escnpement latch to limit the working action o l the ruling' implement dur-- ion' e inert ol its reciprocnttincr movements.

o. A. nnichine ot' the class described coin prisinte' n. carriage for u workssubject, means to nuove the carriage continuously in one direction` u rei'zipromting traine, ruling instrumentulitics incliuling` :t carrier pivotally mounted on the reciprocating'frame, a ruling implement mounted on thc carrier, a guiding element for said implement'and an arm secured to the carrier to traverse a determined path around the guiding element to cause theiruling implement to assume a work position during a part of .its

reciprocating movement.

6. A machine lof the class described com-l prising a carriage, means to move the carriage, a ruling implement mounted in cooperative relation to the carriage, and means to reciprocate said ruling implement transversely to the direction of travel of the carriage, said reciprocating means including a cam, a controlllng lever, means to support the ruling implement, and means to adjust the relative positions of the controlling lever and a partof the ruling implement support y to thereby regulate the length of the ruling stroke of the ruling implement.

7 A machine of the class described, comprising a'carriage, means to continuously move the carriage,l a ruling implement .mounted in cooperative relation to the cardetermine the value of the spacing between the linesinscribed by the ruling implement.

8. In a machine of the class described comprising a Work-supporting carriage and a cooperating reciprocating-frame, a ruling implement on the frame, means to control the engagement of the ruling implement with a work-subject, said means including an escapement, and a guide arm on the reclprocatxng frame to be moved 1n a circui- 'tous path around the escapement, whereby the ruling implement may be brought into cooperative contact with the Work-subject during a. portion of its circle of'movement by the reciprocating frame and lifted from contact with the work-subject during the remainder of the movement of the reciproeating frame.`

W'ILMER SOUDER. 

